Sewing-machine.



n.1. SIBBALD.'

i SEWING MACHINE.. u yAPPLmATIolN mmf-Mmzlrsxz. .xfnewg sEPLzs. wie.

,1,242,875 Y Patented oet'.- 9,1917,

,Zvi "dfi-0%@ 7.

MM@ l Maa enarne-naonnm specicaun of Letters raient.

Yoan, essrenom BY Mnsnnhssreiqisrnitfrs, 'ro naaien esami noi/inane, on new roam n. Y., A ooeronarron or nnwyonn.

dipplieaten ledaanuary 2, i912, Serial lilo. 689,049. Renewed September 25, i916.A Seria11'o .'122,023.

ide it lniown l, @Hannes J. SIBBALD, Troy, in county oi -ilensselaer and @tate of neta anduseul improvements in Sewingilezitiong' panyingdrawings, forming part thereof. .flilns invention has reference to improveieularly to mechanism whereby the feeding of the thread may be so restrained by au Xiliary restraining thread may be broken.

ne object *of the invention is to so con- L, sewing machine that at the compleron of a sewing oper-ation a supply of .may be pulled through, the tension, @i il to starta sewing operation, and ,ai fre-snit oi the pulling; out oi" said a? the rnovernent 'the thread toward i so restrained tin en by of the .s

the following' description.

n thereon.

.ine having the thread tensionj the a'uXilu t invention.

' Fig., 2, represents'a cross sectional view of 1 portions of the saineas taken on line 2-2 Fig., lE omitted.

3, represents a side elevation of portions' of the machine showing a Inodied 'lio 'n oithe thread puller and strainer, actu-.

mechanism. @D Similar numerals of reference designate eorresponding parts in: all figures.

fle shown in the' drawings the unprovernent is disclosed as applied to a button sewmachine of Well known construction havthe bed plate 5 furnished with the head New York, have invented celta-in ehines, e352 Whili the following is a speei-v refereneebelng had to the accom-v nents sewing machines and relates par-` lpivoted Work l ably mounted on the bed plate 5 and is acturneans, 'that said supply et thread being preferably sul:` and 19 tliroughwvhioh the the thread di appear f l le invention consists in the sewing niavy thread restrainerand ineensy for exert-"- oortions of a Sewing machine illustrating' the Work carrier or button clamp loe-- guides 185 18.

and supplied fvvith the use dorm- Patented. eilen.

lng devices comprising theneedle baril sldl ably mounted4 with the needle 8 and 4the looper 9; -Inounted on the `shaftl 10-1ocated beneaththe bed plate.' Below the bedplate dislocated the Worm shaft 11 which drivesptli'mpinion l2 of the/cam llf3 journaled.. on ,thestud ld Whichfdepends `from the bed iplate'j 5. vThe usual base'15 of the button' clampy haying the holder mechanism flgis Inovated in the usual manner to efieet-theyibra- Vtion'jof the buttonr` and fabric t0 `which the in y the iead` and provided' buttonis to be sewn with respect to the path y rotation ofthe sleeve 2 3 is effectedfby-means o-l the coil spring y2? 4ernbracingthe;shaft 22 and 4having its ends engaged respectively With said sleeve 23' and With one of the ears 20. Said lever I24 is operatedv to s Wingthe arm 25 in a path transversel to., thedir'ection of the thread a-,abyfineansfo-,thevrod 28 engaged with ,the leverjj23 and slidpivotally able through a comparatively largeperforation inthe bed 'plate 5, thedowerfbentend 29 of saidrod 28 being. engaged ,with and actuated bythe camthrovvSO.; cfg-the cam l'which cam 3 0 is preferablysol-located on the periphery of said 4 earn,. l3that at the completion of a, group "of s titfchesv'sad cam :ing the lever 2li' and thefarm25, furnished i I vv'iththe thread puller Wire 26,1;Retraotive 30 has acted on the end 294.0-rod12gto3move 'i i downward th'elever, 24tand swinggthe arm 25 yand the thread puller 26, ytothe positions'.

shown in vdottedflines. in Fig.. 2- ,and to .thereby pull the thread a-atra-nsversely1frm its normal path at a 3l having'the ilever arms"32 'and-133 of vwhich the former isfeonnected `rvvi'th their-*od 3e, usually operated by some we llilrnown pointbetween the thread.- f A10o` In the ears 2l, 2lr isjournaled thershaft L i pedal mechanism, v hile the latter arm 33 is connected by work holder 16 whereby' after the completion of'a sewing operation the free end of said button clamp or work holder 16 may' be moved. upward, that is, away.- from the looper 9. I .l In Fig. 3 of the drawings isshown a modification of the device in which shaft 31.`

.is extended in length to form the support for the sleeve 23 of arm 25 and vs aidsleeve 23 isl pinned to said shaft 31 so that said arm 25 is swung outward by the partial rotation of shaft 31 and is retracted by the spring 2f( acting' against said arm 25. and

` against a fixed part ofthe machine.

The cam path or groove of cam 13 in .which the follower '15 of the work holder vibrating mechanism is engaged is shaped in the usual manner to effect, through said usual vibrating mechanism, a series of vibrations ofthe workholder relativepto the YVpath -of the needle and 'finally to hold `said work holder at rest while' two 'or more downward movements .of .the needle are by the guides 18, v18

` stitches last formed, the thread breaks. usu-` 26 s that when asuitable strain is exerted onsaid thread', as by the liftlng of the work holder 16 carrying with it lthe group of ally lat the point of juncture 'with the last stitch.

When the next 'group of' stitches the'shape of fcam member 30 permits the upward movement of rod 28 and the retractive movement of arm 25 andl its thread puller 26 under the action of spring 27 to gradually deliver the thread, previously pulled off, to-the needle. Obviously the cam member 30 may beso shaped that the` retracti've motion of the v arm 25 and its. thread puller maybe sudden if such action is desired. f

i In the modification'shown in Fig. 3 the rod 3,415 preferably manuallyoperated so I lthat. the operation of the arm 25 and its thread puller in the `thread pulling direction is approximately simultaneous with the' operation of straining 'the thread by the lifting of the Work holder and in some cases this construction is preferred 'as the operation. of the thread pulling or restraining means and the movement of the work holder the chain 35 with the forward or free -end of the button clamp or and the thread puller machine is started to sew the or threadstraining,means may be so timed-` tha-t'.y they act, inxefect, to strain the thread 1n oppositev directicrnstofbreak said thread. Having `thus descrlbed my lnvention I claim as new and desire to secure by "Letters Patentv.2.1L A sewing machine comprising/a head, stitch forming means, operatlng means'v therefor, arotary member havinga cam,'a

pair of thread engaging members mounted on'the head, a spring actuatedpmemberf-operating relatively to said thread engaging members, means connected withsald spring' actuated memberandin operative relation vto said camto effecttheoperation of this member againstits spring, a button clamp,

' and meanstofoperate the button clamp to strain the thread@ r 2. A sewingmachinef'comprising a head, stitch forming means, operating means therefor, a/thread` tension, and a pair of complemental thread breaking devices one v eration, 4and/.means to operate said devices.

3; A-sevring-machine comprising a head,

-of.which acts to -draw 'and h'old a supply v. of thread prior to the thread breaking o'p- `stitch Aforming means, -operating .means therefolg'a thread tension, and a pair of ,l complemental .thread breaking devicesboth located above the work, means to operate oneof lsaid devices to draw 0E a supply of` thread and to hold said supply of thread A during the operationof the other 'said de- `vice and to give upA said supply of thread -ator about there-starting of the machine.

A.. A sewingmachine comprising a head,

-stitch ,forming means, operating means therefor, 'a thread tension, and a pair.. of 4c omp'lemental lthread breaking v devices,

means for operating one of said'devices during thel operatlon of the machine todraw thread out of itsnormal feeding 'path and adapted 1to permit lsaid latter device to react to permit the thread to move back' into i said path. A

5; A sewing machine comprising' a head,

l-stitch forming means, operati-ng means therefor, a thread-tension, and a'pair of complemental thread breaking' devices one of which is a work'holder, a work holder actuating cam,` and means; to operate the other of said devices from said cam.

.6. A sewing machine comprising a head,` stitch yforming means, operating means therefor, a vthread tension, and a pair of complemental thread breaking devices one ofwhich. is a workholder, means to effect a predetermined, series of actuations Iof vsaid work holder, and mechanism actuated through ,said means to bring the other of said devices in position to resist the movement of lthe 4threadata predetermined point attained by said'work holder in said actua-J tions. r

f 7. A sewing machine comprising ahead,

Stitch forming meme, operatng means therefor, a thread tension, and a .pair of complementa] 'thread' breakin?- devlces one of said devices being a Wer holder and the other being mounted to swing' ino carry the thred out of. its normal feeding path, and mechanism for eeeting a predetep mined series of acuations of? saisi Work holder, and a progressive positioningmovement of the other said device.

, CHARLES J. SBALD. Witnesses: M. F. MOKA?,

H. J. R. 

